25520004 has 36 divisors (see below), whose sum is σ = 64860796. Its totient is φ = 8460288.

The previous prime is 25520003. The next prime is 25520017. The reversal of 25520004 is 40002552.

It can be written as a sum of positive squares in 2 ways, for example, as 3617604 + 21902400 = 1902^2 + 4680^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (25520003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5112 + ... + 8784.

Almost surely, 2^25520004 is an apocalyptic number.

It is an amenable number.

25520004 is an abundant number, since it is smaller than the sum of its proper divisors (39340792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25520004 is a wasteful number, since it uses less digits than its factorization.

25520004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3876 (or 3871 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 25520004 is about 5051.7327720298. The cubic root of 25520004 is about 294.4152122978.

Adding to 25520004 its reverse (40002552), we get a palindrome (65522556).

The spelling of 25520004 in words is "twenty-five million, five hundred twenty thousand, four".